This happened during my school days. My sister is 5 years elder than me. She was my cousin. Once I went to her home . The outer door was open. When I knocked in to her bedroom, my sister told me not to come since she is doing some urgent work. I became restless and went inside. There I saw the most awesome scenery in my life. My sister standing was standing nude. She was changing her dress. Both of them doesn't know how to react at that time. After few seconds she came to her senses and started shouting at me and I went out. After that I asked her to take classes for me and she agreed. I used to go to her house for seeing her. During tuition she used to sleep a lot, taking advantage of it . I used to touch her clitoris and breasts. Once I even rubbed my penis on her lips. During get together, when we used to sleep together, I used to press her breasts in the name of putting hands on her.